COMMUNICATION
DB-9 Communication Port
To establish communication between the UPS and a computer, connect your computer to the UPS communication port using the supplied communication cable (see Figure 18).
When the communication cable is installed, power management software can exchange data with the UPS. The software polls the UPS for detailed information on the status of the power environment. If a power emergency occurs, the software initiates the saving of all data and an orderly shutdown of the equipment.
The cable pins are identified in Figure 19 and the pin functions are described in Table 3.
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| 6 | 7 |
| 8 | 9 |
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| 1 | 2 | 3 | 4 | 5 |
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| Figure 19. Communication Port |
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Table 3. Communication Port Pin Assignment |
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Pin Number | Signal Name | Function |
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| Direction from the UPS |
1 | Low Batt | Low Battery relay contact; 20 mA, 30 Vdc contact rating | Out | ||||
2 | TxD | Transmit to external device |
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|
|
| Out |
3 | RxD | Receive from external device |
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|
|
| In |
4 | DTR | PnP (Plug and Play) from external device (tied to Pin 6) | In | ||||
5 | GND | Signal common (tied to chassis) |
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|
|
| — |
6 | DSR | To external device (tied to Pin 4) |
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| Out |
7 | — | No Connection |
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|
| — |
8 | AC Fail | AC Fail relay contact; 20 mA, 30 Vdc contact rating | Out | ||||
9 | Power Source | +V (8 to 24 volts DC power) |
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|
| Out |
38EATON Powerware® 9125
